/* =====================================================================
   MODERNÍ BAREVNÝ FORMULÁŘ – 2026 UI (CLEAN + COLORFUL)
   ===================================================================== */

/* ---------------------------------------------------------------------
   1. PROMĚNNÉ
   --------------------------------------------------------------------- */

:root {

    --primary: #7c3aed;       /* fialová */
    --secondary: #06b6d4;     /* cyan */
    --accent: #f97316;        /* oranžová */

    --bg: #f6f7ff;
    --card: #ffffff;

    --text: #111827;
    --muted: #6b7280;

    --success: #22c55e;
    --danger: #ef4444;

    --radius: 20px;
    --shadow: 0 15px 45px rgba(0,0,0,.10);
}

/* ---------------------------------------------------------------------
   2. BODY
   --------------------------------------------------------------------- */

body {
    font-family: system-ui, -apple-system, Segoe UI, sans-serif;

    background:
        radial-gradient(circle at top left, #ede9fe, transparent 45%),
        radial-gradient(circle at top right, #cffafe, transparent 40%),
        radial-gradient(circle at bottom, #ffedd5, transparent 45%),
        var(--bg);

    color: var(--text);
}

/* ---------------------------------------------------------------------
   3. HEADER
   --------------------------------------------------------------------- */

.app-header {
    background: rgba(255,255,255,.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,.06);
}

.navbar-brand {
    font-weight: 700;
    color: var(--text) !important;
}

/* ---------------------------------------------------------------------
   4. CARD
   --------------------------------------------------------------------- */

.form-card,
.success-card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(0,0,0,.05);
    overflow: hidden;
}

/* gradient header (barevný highlight) */

.form-card-header {
    background: linear-gradient(
        135deg,
        var(--primary),
        var(--secondary)
    );

    color: white;
    padding: 2rem;
}

/* footer */

.form-card-footer {
    background: linear-gradient(135deg, #f9fafb, #f3f4f6);
    border-top: 1px solid rgba(0,0,0,.05);
    color: var(--muted);
}

/* ---------------------------------------------------------------------
   5. FORM ELEMENTY
   --------------------------------------------------------------------- */

.form-label {
    font-weight: 600;
    margin-bottom: .4rem;
}

.form-control,
.form-select {
    border-radius: 14px;
    border: 1px solid #e5e7eb;
    padding: .8rem 1rem;
    transition: .2s ease;
    background: #fff;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--secondary);
    box-shadow: 0 0 0 4px rgba(6,182,212,.15);
}

/* input ikony */

.input-group-text {
    background: linear-gradient(135deg, #f3f4f6, #e5e7eb);
    border: 1px solid #e5e7eb;
    color: var(--primary);
}

/* textarea */

textarea.form-control {
    min-height: 160px;
}

/* ---------------------------------------------------------------------
   6. VALIDACE
   --------------------------------------------------------------------- */

.is-valid {
    border-color: var(--success) !important;
}

.is-invalid {
    border-color: var(--danger) !important;
}

.invalid-feedback {
    display: block;
    color: var(--danger);
    font-size: .85rem;
}

/* ---------------------------------------------------------------------
   7. BUTTON
   --------------------------------------------------------------------- */

.btn-primary {
    background: linear-gradient(
        135deg,
        var(--primary),
        var(--secondary)
    );

    border: none;
    border-radius: 14px;
    font-weight: 600;
    padding: .9rem 1.2rem;

    transition: .25s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(124,58,237,.25);
}

/* ---------------------------------------------------------------------
   8. SUCCESS
   --------------------------------------------------------------------- */

.success-icon i {
    font-size: 4.5rem;
    color: var(--success);
    animation: pop .5s ease;
}

@keyframes pop {
    from {
        transform: scale(.6);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* ---------------------------------------------------------------------
   9. ALERT
   --------------------------------------------------------------------- */

.alert {
    border-radius: 14px;
}

/* ---------------------------------------------------------------------
   10. FOOTER
   --------------------------------------------------------------------- */

.app-footer {
    background: #ffffff;
    border-top: 1px solid rgba(0,0,0,.06);
    color: var(--muted);
}

/* ---------------------------------------------------------------------
   11. ANIMACE
   --------------------------------------------------------------------- */

.animate-slide-down {
    animation: slideDown .4s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ---------------------------------------------------------------------
   12. HOVER DETAIL (malý UX bonus)
   --------------------------------------------------------------------- */

.form-card:hover {
    transform: translateY(-2px);
    transition: .3s ease;
}